package com.itheima.security;

import com.alibaba.dubbo.config.annotation.Reference;
import com.itheima.pojo.Permission;
import com.itheima.pojo.Role;
import com.itheima.pojo.User;
import com.itheima.service.UserService;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

/**
 * UserDetailsService接口的实现类
 */
@Component
public class SpringSecurityUserService implements UserDetailsService {
    @Reference
    private UserService userService;

    //根据用户名加载用户信息
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        if(StringUtils.isEmpty(username)){
            return null;
        }
        //远程调用用户服务，根据用户名查询用户信息
        User user = userService.findByUsername(username);
        if(user == null){
            //用户名不存在
            return null;
        }
        List<GrantedAuthority> list = new ArrayList<>();
        Set<Role> roles = user.getRoles();
        if(roles != null && roles.size()>0){
            for (Role role : roles) {
                //授予角色
                list.add(new SimpleGrantedAuthority(role.getKeyword()));
                Set<Permission> permissions = role.getPermissions();
                for (Permission permission : permissions) {
                    //授权
                    list.add(new SimpleGrantedAuthority(permission.getKeyword()));
                }
            }
        }
        UserDetails userDetails = new org.springframework.security.core.userdetails.User(username,user.getPassword(),list);
        return userDetails;
    }
}
